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D( x )
x = 0
180-x = 0
x = 0
x = 0
180-x = 0
180-x = 0
180-x = 0 // - 180
-x = -180 // * -1
x = 180
x in (-oo:0) U (0:180) U (180:+oo)
180/x = x/(180-x) // - x/(180-x)
180/x-(x/(180-x)) = 0
(-1*x)/(180-x)+180/x = 0
(-1*x^2)/(x*(180-x))+(180*(180-x))/(x*(180-x)) = 0
180*(180-x)-1*x^2 = 0
32400-x^2-180*x = 0
32400-x^2-180*x = 0
32400-x^2-180*x = 0
DELTA = (-180)^2-(-1*4*32400)
DELTA = 162000
DELTA > 0
x = (162000^(1/2)+180)/(-1*2) or x = (180-162000^(1/2))/(-1*2)
x = (180*5^(1/2)+180)/(-2) or x = (180-180*5^(1/2))/(-2)
(x-((180*5^(1/2)+180)/(-2)))*(x-((180-180*5^(1/2))/(-2))) = 0
((x-((180*5^(1/2)+180)/(-2)))*(x-((180-180*5^(1/2))/(-2))))/(x*(180-x)) = 0
((x-((180*5^(1/2)+180)/(-2)))*(x-((180-180*5^(1/2))/(-2))))/(x*(180-x)) = 0 // * x*(180-x)
(x-((180*5^(1/2)+180)/(-2)))*(x-((180-180*5^(1/2))/(-2))) = 0
( x-((180*5^(1/2)+180)/(-2)) )
x-((180*5^(1/2)+180)/(-2)) = 0 // + (180*5^(1/2)+180)/(-2)
x = (180*5^(1/2)+180)/(-2)
( x-((180-180*5^(1/2))/(-2)) )
x-((180-180*5^(1/2))/(-2)) = 0 // + (180-180*5^(1/2))/(-2)
x = (180-180*5^(1/2))/(-2)
x in { (180*5^(1/2)+180)/(-2), (180-180*5^(1/2))/(-2) }
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